[Meanmyz]

Thanks for all of your responses guys. I appreciate your input.

For sure, with cats, as it has been written many times (and on Marc's site) with cats, expect to lose around 8 HP. I'll just expect at worst 10 and hopefully it will be less.

My biggest "enlightment" since buying headers, is that MY headers are not considered "long tube headers" for the fact that the tubes have been cut, a foot or so, short for the cats.

This sounds "common sense" but for my un-enlightened case, I assumed that headers, (as produced for the ZR-1), are "long tube headers" (I have seen other headers for other vehicles that definitely for most obvious reasons, can be nothing OTHER than "shorty" headers.

The newly learned point for me being: for "long tube headers" the length of the primary at the back end is of some importance to HP or torque variation, before the collector. Right?

My other question was whether in your opinion, you found my exhaust combination "too loud". I know this is subjective, but I have appreciated your inputs.